﻿using System;
using System.IO;
using System.Net;
using System.Text;
//using System.Media;
namespace XguanjiaMsg
{
    /// <summary>
    /// MD5 32位加密
    /// </summary>
public class MD5CryptoServiceProvider : MD5
     {
         public MD5CryptoServiceProvider()
             : base()
         {
         }
     }
     /// <summary>
     /// Summary description for MD5.
     /// </summary>
     public class MD5 : IDisposable
     {
         /// <summary>
         /// Create 加密方法
         /// </summary>
         /// <param name="hashName"></param>
         /// <returns></returns>
         static public MD5 Create(string hashName)
         {
             if (hashName == "MD5")
                 return new MD5();
             else
                 throw new NotSupportedException();
         }
 
        static public String GetMd5String(String source)
         {
             MD5 md = MD5CryptoServiceProvider.Create();
             byte[] hash;
 
            //Create a new instance of ASCIIEncoding to 
            //convert the string into an array of Unicode bytes.
             UTF8Encoding enc = new UTF8Encoding();
             //            ASCIIEncoding enc = new ASCIIEncoding();
 
            //Convert the string into an array of bytes.
             byte[] buffer = enc.GetBytes(source);
 
            //Create the hash value from the array of bytes.
             hash = md.ComputeHash(buffer);
 
            StringBuilder sb = new StringBuilder();
             foreach (byte b in hash)
                 sb.Append(b.ToString("x2"));
             return sb.ToString();
         }
 
        static public MD5 Create()
         {
             return new MD5();
         }
 
        #region base implementation of the MD5
         #region constants
         private const byte S11 = 7;
         private const byte S12 = 12;
         private const byte S13 = 17;
         private const byte S14 = 22;
         private const byte S21 = 5;
         private const byte S22 = 9;
         private const byte S23 = 14;
         private const byte S24 = 20;
         private const byte S31 = 4;
         private const byte S32 = 11;
         private const byte S33 = 16;
         private const byte S34 = 23;
         private const byte S41 = 6;
         private const byte S42 = 10;
         private const byte S43 = 15;
         private const byte S44 = 21;
         static private byte[] PADDING = new byte[] {
               0x80, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
               0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
               0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
              };
         #endregion
 
        #region F, G, H and I are basic MD5 functions.
         static private uint F(uint x, uint y, uint z)
         {
             return (((x) & (y)) | ((~x) & (z)));
         }
         static private uint G(uint x, uint y, uint z)
         {
             return (((x) & (z)) | ((y) & (~z)));
         }
         static private uint H(uint x, uint y, uint z)
         {
             return ((x) ^ (y) ^ (z));
         }
         static private uint I(uint x, uint y, uint z)
         {
             return ((y) ^ ((x) | (~z)));
         }
         #endregion
 
        #region rotates x left n bits.
         /// <summary>
         /// rotates x left n bits.
         /// </summary>
         /// <param name="x"></param>
         /// <param name="n"></param>
         /// <returns></returns>
         static private uint ROTATE_LEFT(uint x, byte n)
         {
             return (((x) << (n)) | ((x) >> (32 - (n))));
         }
         #endregion
 
        #region FF, GG, HH, and II transformations
         /// FF, GG, HH, and II transformations 
        /// for rounds 1, 2, 3, and 4.
         /// Rotation is separate from addition to prevent recomputation.
         static private void FF(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
         {
             (a) += F((b), (c), (d)) + (x) + (uint)(ac);
             (a) = ROTATE_LEFT((a), (s));
             (a) += (b);
         }
         static private void GG(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
         {
             (a) += G((b), (c), (d)) + (x) + (uint)(ac);
             (a) = ROTATE_LEFT((a), (s));
             (a) += (b);
         }
         static private void HH(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
         {
             (a) += H((b), (c), (d)) + (x) + (uint)(ac);
             (a) = ROTATE_LEFT((a), (s));
             (a) += (b);
         }
         static private void II(ref uint a, uint b, uint c, uint d, uint x, byte s, uint ac)
         {
             (a) += I((b), (c), (d)) + (x) + (uint)(ac);
             (a) = ROTATE_LEFT((a), (s));
             (a) += (b);
         }
         #endregion
 
        #region context info
         /// <summary>
         /// state (ABCD)
         /// </summary>
         uint[] state = new uint[4];
 
        /// <summary>
         /// number of bits, modulo 2^64 (lsb first)
         /// </summary>
         uint[] count = new uint[2];
 
        /// <summary>
         /// input buffer
         /// </summary>
         byte[] buffer = new byte[64];
         #endregion
 
        internal MD5()
         {
             Initialize();
         }
 
        /// <summary>
         /// MD5 initialization. Begins an MD5 operation, writing a new context.
         /// </summary>
         /// <remarks>
         /// The RFC named it "MD5Init"
         /// </remarks>
         public virtual void Initialize()
         {
             count[0] = count[1] = 0;
 
            // Load magic initialization constants.
             state[0] = 0x67452301;
             state[1] = 0xefcdab89;
             state[2] = 0x98badcfe;
             state[3] = 0x10325476;
         }
 
        /// <summary>
         /// MD5 block update operation. Continues an MD5 message-digest
         /// operation, processing another message block, and updating the
         /// context.
         /// </summary>
         /// <param name="input"></param>
         /// <param name="offset"></param>
         /// <param name="count"></param>
         /// <remarks>The RFC Named it MD5Update</remarks>
         protected virtual void HashCore(byte[] input, int offset, int count)
         {
             int i;
             int index;
             int partLen;
 
            // Compute number of bytes mod 64
             index = (int)((this.count[0] >> 3) & 0x3F);
 
            // Update number of bits
             if ((this.count[0] += (uint)((uint)count << 3)) < ((uint)count << 3))
                 this.count[1]++;
             this.count[1] += ((uint)count >> 29);
 
            partLen = 64 - index;
 
            // Transform as many times as possible.
             if (count >= partLen)
             {
                 Buffer.BlockCopy(input, offset, this.buffer, index, partLen);
                 Transform(this.buffer, 0);
 
                for (i = partLen; i + 63 < count; i += 64)
                     Transform(input, offset + i);
 
                index = 0;
             }
             else
                 i = 0;
 
            // Buffer remaining input 
            Buffer.BlockCopy(input, offset + i, this.buffer, index, count - i);
         }
 
        /// <summary>
         /// MD5 finalization. Ends an MD5 message-digest operation, writing the
         /// the message digest and zeroizing the context.
         /// </summary>
         /// <returns>message digest</returns>
         /// <remarks>The RFC named it MD5Final</remarks>
         protected virtual byte[] HashFinal()
         {
             byte[] digest = new byte[16];
             byte[] bits = new byte[8];
             int index, padLen;
 
            // Save number of bits
             Encode(bits, 0, this.count, 0, 8);
 
            // Pad out to 56 mod 64.
             index = (int)((uint)(this.count[0] >> 3) & 0x3f);
             padLen = (index < 56) ? (56 - index) : (120 - index);
             HashCore(PADDING, 0, padLen);
 
            // Append length (before padding)
             HashCore(bits, 0, 8);
 
            // Store state in digest 
            Encode(digest, 0, state, 0, 16);
 
            // Zeroize sensitive information.
             count[0] = count[1] = 0;
             state[0] = 0;
             state[1] = 0;
             state[2] = 0;
             state[3] = 0;
 
            // initialize again, to be ready to use
             Initialize();
 
            return digest;
         }
 
        /// <summary>
         /// MD5 basic transformation. Transforms state based on 64 bytes block.
         /// </summary>
         /// <param name="block"></param>
         /// <param name="offset"></param>
         private void Transform(byte[] block, int offset)
         {
             uint a = state[0], b = state[1], c = state[2], d = state[3];
             uint[] x = new uint[16];
             Decode(x, 0, block, offset, 64);
 
            // Round 1
             FF(ref a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
             FF(ref d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
             FF(ref c, d, a, b, x[2], S13, 0x242070db); /* 3 */
             FF(ref b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
             FF(ref a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
             FF(ref d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
             FF(ref c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
             FF(ref b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
             FF(ref a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
             FF(ref d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
             FF(ref c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
             FF(ref b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
             FF(ref a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
             FF(ref d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
             FF(ref c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
             FF(ref b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
 
            // Round 2
             GG(ref a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
             GG(ref d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
             GG(ref c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
             GG(ref b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
             GG(ref a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
             GG(ref d, a, b, c, x[10], S22, 0x2441453); /* 22 */
             GG(ref c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
             GG(ref b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
             GG(ref a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
             GG(ref d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
             GG(ref c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
             GG(ref b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
             GG(ref a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
             GG(ref d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
             GG(ref c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
             GG(ref b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
 
            // Round 3
             HH(ref a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
             HH(ref d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
             HH(ref c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
             HH(ref b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
             HH(ref a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
             HH(ref d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
             HH(ref c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
             HH(ref b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
             HH(ref a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
             HH(ref d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
             HH(ref c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
             HH(ref b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
             HH(ref a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
             HH(ref d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
             HH(ref c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
             HH(ref b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */
 
            // Round 4
             II(ref a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
             II(ref d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
             II(ref c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
             II(ref b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
             II(ref a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
             II(ref d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
             II(ref c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
             II(ref b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
             II(ref a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
             II(ref d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
             II(ref c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
             II(ref b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
             II(ref a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
             II(ref d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
             II(ref c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
             II(ref b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
 
            state[0] += a;
             state[1] += b;
             state[2] += c;
             state[3] += d;
 
            // Zeroize sensitive information.
             for (int i = 0; i < x.Length; i++)
                 x[i] = 0;
         }
 
        /// <summary>
         /// Encodes input (uint) into output (byte). Assumes len is
         ///  multiple of 4.
         /// </summary>
         /// <param name="output"></param>
         /// <param name="outputOffset"></param>
         /// <param name="input"></param>
         /// <param name="inputOffset"></param>
         /// <param name="count"></param>
         private static void Encode(byte[] output, int outputOffset, uint[] input, int inputOffset, int count)
         {
             int i, j;
             int end = outputOffset + count;
             for (i = inputOffset, j = outputOffset; j < end; i++, j += 4)
             {
                 output[j] = (byte)(input[i] & 0xff);
                 output[j + 1] = (byte)((input[i] >> 8) & 0xff);
                 output[j + 2] = (byte)((input[i] >> 16) & 0xff);
                 output[j + 3] = (byte)((input[i] >> 24) & 0xff);
             }
         }
 
        /// <summary>
         /// Decodes input (byte) into output (uint). Assumes len is
         /// a multiple of 4.
         /// </summary>
         /// <param name="output"></param>
         /// <param name="outputOffset"></param>
         /// <param name="input"></param>
         /// <param name="inputOffset"></param>
         /// <param name="count"></param>
         static private void Decode(uint[] output, int outputOffset, byte[] input, int inputOffset, int count)
         {
             int i, j;
             int end = inputOffset + count;
             for (i = outputOffset, j = inputOffset; j < end; i++, j += 4)
                 output[i] = ((uint)input[j]) | (((uint)input[j + 1]) << 8) | (((uint)input[j + 2]) << 16) | (((uint)input[j + 3]) <<
 24);
         }
         #endregion
 
        #region expose the same interface as the regular MD5 object
 
        protected byte[] HashValue;
         protected int State;
         public virtual bool CanReuseTransform
         {
             get
             {
                 return true;
             }
         }
 
        public virtual bool CanTransformMultipleBlocks
         {
             get
             {
                 return true;
             }
         }
         public virtual byte[] Hash
         {
             get
             {
                 if (this.State != 0)
                     throw new InvalidOperationException();
                 return (byte[])HashValue.Clone();
             }
         }
         public virtual int HashSize
         {
             get
             {
                 return HashSizeValue;
             }
         }
         protected int HashSizeValue = 128;
 
        public virtual int InputBlockSize
         {
             get
             {
                 return 1;
             }
         }
         public virtual int OutputBlockSize
         {
             get
             {
                 return 1;
             }
         }
 
        public void Clear()
         {
             Dispose(true);
         }
 
        public byte[] ComputeHash(byte[] buffer)
         {
             return ComputeHash(buffer, 0, buffer.Length);
         }
         public byte[] ComputeHash(byte[] buffer, int offset, int count)
         {
             Initialize();
             HashCore(buffer, offset, count);
             HashValue = HashFinal();
             return (byte[])HashValue.Clone();
         }
 

        public byte[] ComputeHash(System.IO.Stream inputStream)
         {
             Initialize();
             int count = 0;
             byte[] buffer = new byte[4096];
             while (0 < (count = inputStream.Read(buffer, 0, 4096)))
             {
                 HashCore(buffer, 0, count);
             }
             HashValue = HashFinal();
             return (byte[])HashValue.Clone();
         }
 
        public int TransformBlock(
             byte[] inputBuffer,
             int inputOffset,
             int inputCount,
             byte[] outputBuffer,
             int outputOffset
             )
         {
             if (inputBuffer == null)
             {
                 throw new ArgumentNullException("inputBuffer");
             }
             if (inputOffset < 0)
             {
                 throw new ArgumentOutOfRangeException("inputOffset");
             }
             if ((inputCount < 0) || (inputCount > inputBuffer.Length))
             {
                 throw new ArgumentException("inputCount");
             }
             if ((inputBuffer.Length - inputCount) < inputOffset)
             {
                 throw new ArgumentOutOfRangeException("inputOffset");
             }
             if (this.State == 0)
             {
                 Initialize();
                 this.State = 1;
             }
 
            HashCore(inputBuffer, inputOffset, inputCount);
             if ((inputBuffer != outputBuffer) || (inputOffset != outputOffset))
             {
                 Buffer.BlockCopy(inputBuffer, inputOffset, outputBuffer, outputOffset, inputCount);
             }
             return inputCount;
         }
         public byte[] TransformFinalBlock(
             byte[] inputBuffer,
             int inputOffset,
             int inputCount
             )
         {
             if (inputBuffer == null)
             {
                 throw new ArgumentNullException("inputBuffer");
             }
             if (inputOffset < 0)
             {
                 throw new ArgumentOutOfRangeException("inputOffset");
             }
             if ((inputCount < 0) || (inputCount > inputBuffer.Length))
             {
                 throw new ArgumentException("inputCount");
             }
             if ((inputBuffer.Length - inputCount) < inputOffset)
             {
                 throw new ArgumentOutOfRangeException("inputOffset");
             }
             if (this.State == 0)
             {
                 Initialize();
             }
             HashCore(inputBuffer, inputOffset, inputCount);
             HashValue = HashFinal();
             byte[] buffer = new byte[inputCount];
             Buffer.BlockCopy(inputBuffer, inputOffset, buffer, 0, inputCount);
             this.State = 0;
             return buffer;
         }
         #endregion
 
        protected virtual void Dispose(bool disposing)
         {
             if (!disposing)
                 Initialize();
         }
         public void Dispose()
         {
             Dispose(true);
         }
     }
}
